Inflatable beam and use of this inflatable beam

ABSTRACT

Inflatable beam ( 1 ) comprising fire hoses or other industrial seamless hoses with woven textile braiding, inner air-tight lining and optional outer protective coating, is composed of an assembly of at least three hoses ( 2 ) arranged longitudinally side by side, where ends of the hose ( 2 ) are closed by a closure ( 3 ). At least one of the hoses ( 2 ) comprises at least one inlet and/or discharge member ( 4 ) for an inflating medium. The hoses ( 2 ) are at the point of contact of their circumferences, or at place of the closest distance of their circumferences mechanically connected by stiff connections ( 5 ) spaced along the length of the assembly of the hoses ( 2 ), at least one length (L) of at least one hose ( 2 ) between adjacent connections ( 5 ) of the hoses ( 2 ) is smaller than the length (M) of the other hoses ( 2 ) between these connections ( 5 ).

This application is a National Stage Patent Application ofPCT/SK2018/050003, filed on Feb. 13, 2018, which claims the benefit ofpriority to Slovakian Patent Application No. PUV50015-2017, filed onFeb. 14, 2017, the disclosure of which is incorporated by referenceherein in its entirety.

TECHNICAL FIELD

The technical solution relates to inflatable beams for groundconstructions, in particular for providing of temporary roofings such astents, hangars, stages and other standard and atypical shelters, as wellas for providing auxiliary structures for holding and suspending oftechnical items and footbridges or for securing other rigid orinflatable construction against falling.

BACKGROUND ART

Inflatable beams are commonly known and used as supporting structures oftents, roofings, shelters, and the like. These inflatable beams aretypically tubular, either continually inflated or airtight.

In case of continually inflated beams, the problem is low operatingpressure (approx. 1 kPa) and necessary large diameter of the beamsrelated thereto, as well as the need for continual air inflation.

Operating pressure in airtight beams is typically 15 to 40 kPa, whatsignificantly helps to reduce the diameter of the beams. Regarding thestrength of the material from which they are made, the higher pressureis however undesirable (destructive), and therefore such beams need tobe equipped with overpressure valves. It is common that increasedpressure resulting from an increase in air volume during sunny days iscompensated by overpressure valves. However, afterwards in cold nighthours released air is missing and a tent, its supporting structurerespectively, usually collapses.

In order to overcome mentioned problem, seamless inflatable beams withhigher operating pressure without a need of pressure compensationthrough overpressure valves appear to be the most advantageous.

In order to overcome the mentioned disadvantage, e.g. fire hoses areused, which are easily available. The use of fire hoses as a roofstructure supports is disclosed in EP 0810339. This solution allows forformation of temporary roofing by means of the structure which comprisesinflatable beams, advantageously formed of the fire hoses. These hosesare at their ends connected to rigid supporting elements arranged in arow. When creating the cover for an area, rigid supporting elements areplaced along the sides of the area to be covered, whereas these elementsalso serve as an air supply duct for the said hoses. The hoses areconnected with their respective ends to these supporting elements, whichafter inflating thus form an arc, a series of arches respectively,between said supporting elements. A cover sheet is then fixed upon theseries of arches. This solution provides arched cover opened at the ends(a tunnel); however, due to the system of supporting elements it is notsuitable for tent structures.

A tent is known from SK 6715 Y1 having inflatable support structurewhich uses as inflatable beam made of standard fire hose or otherindustrial seamless hose with outer textile braiding, the hose beingclosed at each end by a plug, at least one of which comprises airinflation or discharge member, and at least one end of the hose isattached to or placed against the outer cover of the tent or the floorportion of the tent. The use of standard fire hoses or other industrialseamless hoses with outer textile braiding and an internal airtightlining allows for higher operating pressure without a need for pressurecompensation by overpressure valves. The shape and overall size of thetent structure is thus defined and does not change even at the pressurefluctuations caused by a change of temperature or pressure of theoutside environment. Due to the fact that the tent cover and the floorportion generally form one piece, or the ends of the hose are anchoredto the floor portion, the hose is formed into a substantially arcuateshape, in particular according to the shape predefined by the design ofouter cover and the floor portion.

The inflatable beam of SK 6715 Y1 provides a relatively inexpensive highstrength element for inflatable supporting structures. One disadvantageof the beam as disclosed in the mentioned document is that it can onlybe used in combination with other tent parts, which will ensure itsbending in the arc when this beam is being inflated. This beam as suchis not capable to acquire desired shape after inflating, and thereforeit cannot be used to form, e.g., a stand-alone arc serving, for example,for holding and suspending of technical items, e.g. lighting.

Though it is obvious that constructions employing the beam of SK 6715 Y1have high strength and stability with regard to a change of temperatureor environment, it is possible to build tents only up to certaindimensions, and it is not possible to use such beam as stand-alone, outof the entire tent structure.

Object of this technical solution is to substantially eliminatedeficiencies of the prior art that consist especially in limited use ofthe inflatable beam formed of standard fire hose or other industrialseamless hose with outer textile braiding, due to its strength and alsoits own structure.

SUMMARY OF INVENTION

This object is achieved by an inflatable beam according to the presenttechnical solution, characterized in that it is composed of an assemblyof at least three fire hoses or other industrial seamless hoses withwoven textile braiding and internal air-tight lining and optionallyexternal protective coating, arranged longitudinally side by side, wherethe ends of the hose are closed by a closure and at least one of thehoses comprises at least one inlet and/or discharge element for aninflating medium, the hoses being at the point of contact of theircircumferences, or at place of the closest distance of theircircumferences mechanically connected by stiff connections spaced alongthe length of the hoses, where at least one length of at least one hosebetween adjacent connections is less than the length of the other hosesbetween these connections.

The hoses are thus arranged and mechanically bound such that theirstability and bending strength is increased and the arcuate or steppedarch shape of the beam is predefined.

Stiff connections of the hoses in a bundle can be both demountable andnon-demountable. In the case of a non-demountable connection, it ispossible to connect directly the hose braiding in the respectivelocations either by gluing or sewing. In other words, a stiff connectioncan be formed directly on the hose surface.

Preferably, the stiff connection of the hose assembly may be provided ona sleeve of the hose, which is immovable relative to the hose. Theimmovability of the sleeve can be achieved, for example, by tightenclosing of the hose or by providing a stiff connection between thesleeve and the hose, e.g. by gluing, welding (of plastics), sewing,depending on the material used for the sleeve. Such a hose sleeveencloses the outer circumference of the hose and may be made of avariety of suitable materials such as metal, plastic, fabric, composite,and the like. Sleeves themselves can then be connected demountably aswell as non-demountably, using suitable technology with respect to thematerial of the hose sleeve.

In order to improve strength of the beam and stability of the hoses inthe assembly, the hose assembly can be enclosed on the outercircumference by at least one sleeve of the hose assembly. This hoseassembly sleeve may cover the entire length of the hose assembly, i.e.,there substantially is only one on the entire hose assembly.Furthermore, the hose assembly sleeve may cover only a portion of thelength of the hose assembly, while there may be only one on the entirelength of the hose assembly, or there may be a plurality of such sleevesspaced apart from each other over the entire length of the hoseassembly. It is the most preferable, with a plurality of the hoseassembly sleeves, to place these sleeves at locations of the stiffconnections of the hoses.

The stiff connections of individual hoses in the assembly are preferablychosen so that the inflatable beam has configuration of the hoses, incross-section, which is the most advantageous for the beam in theinflated state for a given number of hoses in respect of stability ofindividual hoses in the beam, or also in respect of transversaldimension or the shape of the beam.

Because at least one of the hoses of the assembly has at least oneshorter length between adjacent stiff connections than the length of theother hoses of the assembly between these connections, then byconnecting the hoses on such portions ensures that the hoses, beinginflated, will form the beam into an arc. If in some case said conditionfor lengths of the hoses between the stiff connections is used only forsome portions of the hoses and other portions of the hoses will have thesame length of the hoses between the connections in given assembly, thenit is also possible to provide a beam in the form of a stepped arc, i.e.arcuate and straight sections will be combined. Radius or curvature ofthe arc can be suitably pre-selected by adjusting the difference of thelengths of the hoses of the assembly between adjacent stiff connections.When the beam is used as an integral part of a tent, roofing or similarstructure, its resulting shape may also be affected by a part of thetent, roofing or similar construction adjacent to the beam, which ise.g. the outer cover of the tent, and possibly the floor of the tent.

The stiff connections of the hoses of the assembly can also serve aspoints on the beam, with which the beam can be attached to otherobjects, to a roof parts of a shelter, mutually to other beams, or forsuspending objects under the beam.

Besides mechanical connection, individual hoses in the assembly can bemutually pneumatically connected, thus achieving the advantage ofcentral inflation, i.e., inflating through one inflating member on onehose in the assembly. It is also possible to provide pneumaticconnections with one-way valves or overpressure valves to increasesafety of the beam in case of air leak from one of the hoses.

Closures at the ends of the hose may be made in the form of a closingflange, usually circular according to the cross-section of the hose, aclamp, optionally secured by rolling-up the hose, by using a glue, ormay be made by other known ways.

The ends of the hoses in the assembly may preferably be mechanicallyinterconnected, whereby the beam will have stable end. This can be doneby mechanically attaching the ends of the hoses to a common platform,e.g. a metal plate, a board, and so, whereby a base is obtained whichcan be directly anchored to the ground then. It is also possible toplace the ends of the hoses in a common case, whereby the base isprovided, which is advantageously usable in a tent comprising anintegrated floor, where the beam is pushed against a tent cover. Withregard to connecting the ends of the hoses, it is possible to connectthe ends of all hoses in the assembly or just some of the ends of thehoses.

In order to improve the shape stability of the beam under forces, it isadvantageous to tie the hose assembly with a chord. Then, the mostpreferably between two points of the above-described mechanicalconnection of the hoses in the assembly.

This technical solution considers air as the most available gaseousmedium to be the inflating medium for the hoses. However, it is obviousthat other suitable gases can be used, as e.g. Nitrogen or CO₂.

The use of standard fire hoses or other industrial seamless hoses withouter textile braiding and internal air tight lining provides for higheroperating pressure without a need for pressure compensation byoverpressure valves. The shape and strength of the inflatable beamaccording to this technical solution is therefore sufficientlyguaranteed also in the case of pressure fluctuations caused by changesof the ambient temperature or pressure. Operating pressures inindividual hoses of the beam according to this technical solution may bein the range of 100 to 1000 kPa, while lower pressure is applied inhoses with greater diameters and higher pressure is applied in hoseswith smaller diameters. However, the pressure in the hose is always suchthat no additional compensation of the pressure in the hose due tochanges of the ambient pressure or temperature is in any way necessary.

BRIEF DESCRIPTION OF DRAWINGS

Technical solution is described more in detail in attached drawings,wherein

FIG. 1—shows schematic side view of unfolded, not inflated beamaccording to this technical solution;

FIG. 2—shows overall front view of the stand-alone beam according tothis technical solution;

FIG. 3—shows view in axonometry of variants, a, b, c, of mechanicconnections of the ends of the beam according to this technicalsolution;

FIG. 4—shows schematic view of variants, a, b, c, d, e, f, g, h, of thearrangement of the hoses in cross-section of the beam according to thistechnical solution;

FIG. 5—shows schematic view of variants, a, b, of mechanic connectionsof the hoses of the beam according to this technical solution;

FIG. 6—shows schematic view of variants, a, b, c, of the closures of theends of hoses with details of sections A-A, B-B of the closures;

FIG. 7—shows schematic view of variants of pneumatic connections ofhoses of the beam according to this technical solution;

FIG. 8—shows axonometric view of variants of traversing of the beamsaccording to this technical solution, a—having the beams in alldirections ended before the point of their crossing, b—having the beamsin one direction ended before the point of their crossing, c—having thecrossing of the beams elevated;

FIG. 9—shows axonometric view of a tunnel-shape tent with the beamsaccording to this technical solution arranged in a row;

FIG. 10—shows axonometric view of a shelter with the beams according tothis technical solution traversed;

FIG. 11—shows axonometric view of a stage roofing with the beamsaccording to this technical solution, in variants a—with two beams,b—with one beam;

FIG. 12—shows axonometric view of an advertisement inflatable arc with asupporting structure composed of the beam according to this technicalsolution in variants a—with the beam placed inside the body of theadvertisement inflatable arc, b—with the beam placed outside the body ofthe advertisement inflatable arc;

FIG. 13—shows axonometric view of the beam according to this technicalsolution as a stand-alone support;

FIG. 14—shows axonometric view of an arrangement of the beams accordingto this technical solution serving as arcuate supporting structure forsuspended footbridge.

DESCRIPTION OF EMBODIMENTS

Basic embodiment of the inflatable beam 1 according to this solutioncomprises three hoses in triangular layout in cross-section, as bestseen in FIG. 3, FIG. 4a, b , FIG. 5 a, b, and FIG. 7. The inflatablebeam 1 according to this solution according to FIG. 2 is then composedof the assembly of three fire hoses or other industrial seamless hoses 2with woven textile braiding and internal airtight lining arrangedlongitudinally side by side.

Each hose 2 is closed at each of its end by a closure 3. Examples ofvariants of embodiments of the hose 2 closures 3 are shown in FIG. 6,wherein variant a shows the closure 3 in the form of a closing flange 6,variant b shows the closure 3 in the form of a clamp 7 and variant cshows the closure 3 in the form of the clamp 7 with an air passage 8.Each of the hoses 2 comprises at least one inlet and or discharge member4 of the inflating medium. Example variants of arrangement of the inletand/or discharge members 4 are shown in FIG. 7, wherein the variant ashows separate inlet/discharge members 4, valves, for each hose 2 of thebeam 1, variant b shows the inlet/discharge member 4 on one hose 2, towhich the other hoses 2 are then connected by their respectiveinlet/discharge members 4, and variant c shows the inlet/dischargemember 4 on one hose 2, to which the other hoses 2 are then connected bytheir respective inlet/discharge members 4, while the other hoses 2 aremutually connected.

The hoses 2 are longitudinally mechanically connected by stiffconnections 5 which are spaced apart along the length of the hoses 2,while at least one length L of at least one hose 2 between adjacentstiff connections 5 is smaller than the length M of the other hoses 2between these connections 5.

The lengths L, M of the hoses 2 in sections between the adjacentconnections 5 are different, resulting in that the beam 1 has in theindividual layers K composed of the hoses 2 different radius, and thusthe whole beam 1 has in inflated state arcuate shape. This is wellillustrated in FIG. 1. In this figure, the hose 2, which will form thebottom layer K₁ with the smallest radius of the beam 1, is inflated andis straight. The other hoses 2 of the next layer K of the beam 1, i.e.the layers K₂ of the hoses 2 of the outer radius of the beam 1, whenempty or inflated only partially will form waves between the connectingelements 5 due to their greater length M.

In this embodiment, the inflatable beam 1 is made such that the hoses 2are at first shortened to calculated total lengths corresponding to theindividual layers K of the beam 1, that is to the planned radius of thebeam 1. Subsequently, proportional sections are marked, that is lengthsL, M on the respective hoses 2 representing a certain percentage portionof the hose with respect to the respective number of the connectingmembers 5. Finally, the stiff connections 5 are formed on the hoses 2 atmarked lengths L and M, by which the hoses 2 of the beam 1 are togetherfirmly connected, i.e. the hoses 2 cannot be displaced relative to eachother at the locations of the stiff connections 5. Then, all hoses 2 areinflated to operating pressure, while due to the difference of lengthsL, M, between the stiff connections 5, the resulting inflated beam 1bends into the shape of an arc. If the beam 1 is to have a partiallybend shape, thus not a whole arc, then the proportional adjustment ofthe lengths L and M is made only on some selected sections.

The beam 1 according to this technical solution shown in theaccompanying drawings is arcuate along its entire length, that is, alllengths L are smaller than all respective lengths M. However,embodiments of the beam 1 are possible having in one or more sectionsbetween the stiff connections 5, the length L equal or substantiallyequal to the length M. Such adjustments may be advantageous when amodification of the shape of the beam 1 is needed, whereas such straightsections can be formed regularly as well as irregularly, and in any partof the length of the beam 1 as required. Said embodiment of the beam isnot shown in drawings, because it is easy to imagine such an arrangementof the beam 1.

Particular example embodiments of the stiff connections 5 are shown inFIG. 5 a, b. According to FIG. 5 the stiff connections 5 are formed onsleeves 51 of the hoses 2. The sleeves 51 are tightly enclosed aroundthe hoses 2, or can be attached to the hoses 2 such that to preventdisplacement of the sleeve 51 against the hose 2. The sleeves 51 of thehoses 2 are then connected by the stiff connections 5 at points ofcontact of circumferences of the hoses 2. The point of contact ofcircumferences of the hose 2 is to be understood in the context of thissolution and in the context of the claims as the place of the actualcontact either of the own surfaces of the hoses 2, that is the braiding,or the point of contact of surfaces of the sleeves 51, or in the case ofmaking of the stiff connection 5 in other but contact manner, also as aplace where circumferences of the hoses 2 are closest to each other,when direct contact of the surfaces of the hoses 2 or the surfaces ofthe sleeves 51 is not possible due to the presence of a body of theconnection itself, such as a screw connection, a pressed connection, andthe like.

The stiff connection 5 with contacting surfaces, in this example of thesleeves 51, is shown in FIG. 5a , and the stiff connection 5 where thesurfaces, in this example of the sleeves 51 are not in contact due tothe presence of the body of the connection, e.g. screw connection isshown in FIG. 5 b.

In the example of FIG. 5a particular example embodiment is also shown,where the hose 2 assembly is on its outer periphery enclosed by thesleeve 52 of the hose 2 assembly. This sleeve 52 may be formed as aseparate body, i.e. independently of the members of the stiff connection5 in this example of the sleeves 51, but it can also be formed such thatsleeves 51 of the hoses 2 are used that are connected at the locationson the outer circumference of the sleeves 51 with respect to the overallouter shape of the hose 2 assembly.

The resulting beam 1 can be attached to a surface by attaching one ormore ends of the hoses 2 to the given surface. This may advantageouslybe achieved by means of an eye anchor 9 on the closing flange as shownin FIG. 6a . In the case that the beam 1 will be attached to the surfaceby only one hose 2 or only part of the hoses 2, the ends of the hoses 2,not attached to the surface, may be closed by another type of closure 3,e.g. by a clamp 7 as shown in FIGS. 6b, c , and FIG. 3 c.

Regarding stability and strength of the beam 1, it is the mostpreferable to form the end of the beam 1 by mechanically connecting theends of more than one hose 2 on a common platform 10. This platform 10may be, e.g. a metal plate, board, or other, the most preferably flatbase, which can then be laid on the surface, and also to secure theposition of the beam 1 relative to the surface, anchored to the surfaceby known ways.

It is also possible to place the ends of the hoses 2 in a common sleeve11 whereby the end of the beam 1 is obtained, which can be preferablyused inside, for example, a tent which comprises integrated floor 26,where the beam 1 is pushed against the tent cover 25. With regard toconnecting the ends of the hoses 2 in such a sleeve, it is also possibleto connect the ends of all hoses 2 of the beam 1 or only some of theends of the hoses 2.

The beam 1, in regard of the number of hoses 2 has been described aboveas the beam 1 with the number of hoses being three, where in therespective figures the layer K₁ of the hoses 2, of the inner radius ofthe beam 1 comprises one hose 2 and the layer K₂ of the hoses 2 of theouter radius of the beam 1 comprises two hoses 2.

Total number of the hoses 2 of the beam 1 as well as the number of thehoses 2 in individual layers K of the beam 1 may form variousarrangements and may be chosen according to specific requirements onload bearing capacity and stability of the beam 1. Example arrangementsof the hoses 2 are shown in the cross-section of the beam 1 in FIG. 4.It is clear that it is possible to provide the beam 1 also with othernumbers and arrangement of the hoses 2 as already shown, and also it ispossible to use for the assembly the hoses 2 of the same diameter, aswell as the hoses 2 with different diameters in respective layers K ofbeam 1.

In order to improve shape stability of the beam 1 during acting ofvertical forces, it is advantageous to tie the hose assembly 2 with achord 12. Then the most preferable is to attach such chord 12 at thepoints of the stiff connections 5 of the hoses 2 as shown for example inFIG. 2. The chord 12 can then also serve as a ramp for placing otherelements, e.g. stage lighting as shown in FIG. 11 and FIG. 13. Thischord 12 for example may have the form of a rope, rigid beam, and thelike.

The beam 1 can be used in various applications, the examples of whichare shown in FIG. 9 to FIG. 14.

FIG. 9 shows the example of use of the beam 1 as part of a tent, hall orhangar with multiple beams 1 arranged in a row one after the other. Inthis example of embodiment, the beams 1 are placed in the space definedby the outer cover 25 and the floor 26 of the object, while the beam 1and the outer cover 25 mutually affect each other in regard of theshape. The beams 1 lean against the outer cover 25 on the major part oftheir length, and the outer cover 25 is attached to the beams 2. Thefloor 26 of the object defines by its dimension the span of the beam 1.The object can also be made without the floor 26. In this case, it isnecessary to attach the ends of the beams 1 for example, to the floorstrips 27 of defined length or directly to the ground or other surface.The beams 1 can be mutually spaced by rigid or inflatable spacingmembers 28. Appropriate design of the outer cover 25, optionally windbracing 29 between the beams 1 and the outside anchoring 30, will ensurethe overall stability of the object even under severe climaticconditions. Fixing of the outer cover 25 to the beam 1 is carried out inknown ways, the most preferably at the locations of the stiffconnections 5 of the hoses 2 on the beam 1.

FIG. 10 shows use of the beam as part of a tent, hall or roofing withseveral beams 1 that traverse each other. As in the previous embodiment,also in this example of embodiment, the beams 1 are placed in the spacedefined by the outer cover 25 and the floor 26 of the object. Thespacing and attachment of the beams 1 is also defined identically as inthe preceding example. The connecting member 31 of the hose 2 crossingmay take different shapes and configurations, dependent in particular onthe number of hoses, beams, and junction angle. The most common shapesare e.g. “X” and “T”. Respective closures 3 of the hoses 2 on thecrossing connecting members 31 may also include inlet and/or dischargemember 4. It is of course also possible to traverse the hoses 2 evenwithout the use of the connecting member 31. For example, for theparticular example of embodiment of the cupola tent, the connectingmember 31 is not used and the beams 1 in this case cross one above theother without being interrupted, optionally only a part of the hoses 2of the beam 1 is interrupted, thereby the beams 1 mutually engage.

FIG. 11 shows the use of the beam 1 as part of a stage roofing. Theinflatable beam 1 is used as the front edge defining the stage visual.From the beam 1, which must be firmly anchored in forward and backwarddirections, by anchors 30, e.g. by the outer anchoring ropes, the outercover 25 continues sloping downwards, where it is attached to thesupport members 33 or to the podium. In the case of a greater depth ofthe stage, it is possible to arrange two or more inflatable beams 1 in arow including the outer cover 25 as it is with the tunnel tent describedabove and shown in FIG. 9. From the rear beam 1, the cover 25 continuesas described above, or the stage roofing is terminated by the rear beam1. Any of used inflatable beams 1 may also be used as a carrier forequipment, lighting, signs, and the like.

FIG. 12 shows the use of the beam 1 as safety support structure of theadvertising inflatable arc 22. FIG. 12a shows alternative placement ofthe inflatable beam 1 within the body of the advertisement inflatable22, which is inflated to significantly lower pressure. FIG. 12b is thenalternative placement of the beam 1 as a separate attached element tothe body of the advertisement inflatable 22, in particular on theoutside of the inner diameter of the arc of the inflatable 22.

The advantage of inside placement in the body of the inflatable 22 isundisturbed design, less exposure to the outside environment, and thusalso safety and direct outside anchoring 30 for the case of collapsingthe advertisement inflatable 22 due to a power failure or rupture of thecover of the inflatable 22.

FIG. 13 shows the use of the beam 1 as a stand-alone support, which ispreferably used, for example, for suspension of audiovisual or lightingequipment, projection screen, advertising signs, and the like. As astand-alone object, the beam 1 must be firmly anchored in forward andbackward directions by outside anchors 30. In particular, in FIG. 13,lights are mounted on the chord 12, while the chord 12 is hung on thebeam 1 on the suspension member 36, which can be e.g. a rope, in orderto increase the load bearing capacity.

FIG. 14 shows the use of an assembly of two arcuate beams 1 as a supportfor a temporary suspended footbridge 37, for example, in the case ofdestruction of the bridge during the flood. The beams 1 shown in theexample are led parallel and inclined to each another and at the highestpoint they are in contact and at the same time they are spaced apart indirection to their end by horizontal spacers 35. An embodiment is alsopossible, where the beams 1 are inclined to each other but are not incontact, as well as an embodiment where the beams 1 are parallel to eachother with the same length of the horizontal spacers 35 over the entirelength of the beams 1. The footbridge 37 suspension members 36, e.g.ropes, are led from the beams 1, the most preferably form the locationsof the stiff connections 5. Ends of the beams 1 are attached to theground through the platform 10 and the ends of the footbridge 37 areattached thereto or to the plane thereof. In order to increase safety,it is also advantageous to anchor the entire assembly by outside anchors30.

The above-mentioned examples of embodiments are introduced forillustrative purposes only, without limiting the scope of protectiondefined by the claims in any way. It is clear that by exploitation ofprinciples described in this technical solution, it is possible tocreate great number of applications with the use of the beam 1 besidethose, which are described as particular examples of use of the beam 1according to this technical solution.

The beam 1 according to this technical solution provides rigid andstable structure member especially for temporary constructions, wheresimple logistics, quick installation and labor savings are importantfactors.

The invention claimed is:
 1. An inflatable beam comprising industrialseamless hoses with woven textile braiding and an inner air-tight liningwherein the beam comprises an assembly of at least three hoses arrangedlongitudinally side by side, where ends of the hose are closed by aclosure, and at least one of the hoses comprises at least one inlet foran inflating medium, the hoses being at the point of contact of theircircumferences, or at place of the closest distance of theircircumferences mechanically connected by a plurality of stiffconnections spaced along the length of the assembly of the hoses apartfrom the closure, wherein at least one length of at least one hosebetween adjacent connections of the hoses is smaller than the length ofone or more other hoses between these connections, wherein the at leastone hose extends beneath one or more of the other hoses to form aninflated arc.
 2. The inflatable beam according to claim 1, wherein theclosures comprise a closing flange, clamp, or glued joint.
 3. Theinflatable beam according to claim 1, wherein the hoses are mutuallypneumatically connected.
 4. The inflatable beam according to claim 3,wherein the mutual pneumatic connections of the hoses comprise closing,one-way or overpressure valves.
 5. The inflatable beam according toclaim 1, wherein the stiff connection is provided on the surface of thehose, or on a sleeve of the hose attached to the hose.
 6. The inflatablebeam according to claim 1, wherein the assembly of the hoses is on itsouter periphery enclosed by at least one sleeve.
 7. The inflatable beamaccording to claim 6, wherein the sleeve of the assembly of the hosescovers the entire length of the assembly of the hoses, or the sleevescover part of the length of the assembly of the hoses and are placed atthe locations of the stiff connections.
 8. The inflatable beam accordingto claim 1, wherein the ends of at least of two hoses are mechanicallyconnected.
 9. The inflatable beam according to claim 8, wherein themechanical connection of the ends of the hoses is comprised of theclosures of the hoses connected to a common platform.
 10. The inflatablebeam according to claim 8, wherein the mechanical connection of the endsof the hoses is comprised of a sleeve, in which the ends of the hosesare placed.
 11. The inflatable beam according to claim 1, wherein thehoses have the same diameter.
 12. The inflatable beam according to claim1, wherein the hoses have different diameters.
 13. Use of the beamaccording to claim 1, for building a tent, hall, or hangar with thebeams in a row.
 14. Use of the beam according to claim 1 for building atent, hall, or roofing with the beams, which are mutually traversed. 15.Use of the beam, according to claim 1 for building of a front edge of astage roofing.
 16. Use of the beam according to claim 1 for building ofa supporting structure of an advertisement inflatable arc.
 17. Use ofthe beam according to claim 1 for building of a stand-alone arcuatesupport.
 18. Use of the beam according to claim 1 for building ofsupporting structure of a suspended footbridge.
 19. An inflatable beamcomprising: a plurality of industrial seamless hoses comprising three ormore industrial seamless hoses, each industrial seamless hose comprisingan inner air-tight lining and woven textile braiding extending about theinner air-tight lining, the plurality of industrial seamless hosesextending along an overall first length from a first end to a secondend; a closure sealing at least one hose of the plurality of industrialhoses at the first end or the second end; a common platform mechanicallyconnecting the plurality of industrial seamless hoses at the first endor the second end; and a plurality of stiff connections spaced along theoverall length between the first end and the second end, each stiffconnection mechanically connecting the plurality of industrial seamlesshoses apart from the common platform and the closure, wherein at leastone length of at least one hose between adjacent stiff connections issmaller than the length of the other hoses between these connections,and wherein the at least one hose extends beneath one or more of theother hoses to form an inflated arc.
 20. An inflatable beam comprising:a plurality of industrial seamless hoses comprising three or moreindustrial seamless hoses, each industrial seamless hose comprising aninner air-tight lining and woven textile braiding extending about theinner air-tight lining, the plurality of industrial seamless hosesextending along an overall first length from a first end to a secondend; a closure sealing at least one hose of the plurality of industrialhoses at the first end or the second end; a common platform mechanicallyconnecting the plurality of industrial seamless hoses at the first endor the second end; a plurality of stiff connections spaced along theoverall length between the first end and the second end, each stiffconnection mechanically connecting the plurality of industrial seamlesshoses apart from the common platform and the closure; and a sleeveextending over the plurality of industrial seamless hoses and one ormore of the plurality of stiff connections, wherein at least one lengthof at least one hose of the plurality of industrial seamless hosesbetween adjacent stiff connections is smaller than a length of the otherhoses of the plurality of industrial seamless between the adjacentconnections, and wherein the at least one hose extends beneath one ormore of the other industrial seamless hoses to form an inflated arc.